Answer:
[tex]2x^3-x^2-x+4[/tex]
Step-by-step explanation:
The root of a polynomial: the value of which x makes f(x) = a,x^n+a₂x^n-1+...+aₙx+aₙ⁺₁=0
Because the polynomial has exactly 3 roots, we know that f(x) = (x+a) (x+b) (x+c)
(-a,-b and -c are the 3 roots)
So its highest digit is 3.
Only 2x³ - x² - x + 4 corresponds to it.
